Rossmoyne, a census-designated place (CDP) in Sycamore Township, Hamilton County, Ohio, United States, 13 miles (21 km) northeast of downtown Cincinnati. The population of Rossmoyne was 2,230 at the 2010 census. source

North American area code 513 serves southwest Ohio including Cincinnati and many surrounding cities, such as Forest Park, Hamilton, Lebanon, West Chester, Mason, Middletown, Norwood, Oxford, Harrison, Cleves, Miamitown and Trenton. source